JPS5836226B2 - ondokenshiyutsu valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is applicable to, for example, an internal combustion engine of a vehicle, since the engine characteristics are not deteriorated in the low temperature range of the engine. G. R.
, relates to a device that is applied as a valve that does not activate an exhaust gas control device such as a choke opener, but activates the device when the temperature reaches a high temperature range.

As a temperature detection valve device of this type, there is already a device configured to simultaneously switch two 3-port 2-way valves that simultaneously switch different passage systems according to temperature changes using a single thermostat that expands and contracts in proportion to temperature changes. Proposed.

In this conventional device, a disk is fixed to the shaft at one end of the thermostat, and as the thermostat expands and contracts, the disk is displaced and drives the two valves.In this way, the expansion and contraction of the thermostat directly affects the disk. There is a risk that the valve may stick to the valve seat when it comes into contact with the valve seat, resulting in a reduction in operational reliability.

In view of the problems of the conventional device described above, the present invention has been made to:
It is an object of the present invention to reliably prevent two valves from sticking to respective valve seats arranged on both sides in the direction of displacement.

To achieve this purpose, the shaft at one end of the thermostat, which is axially displaceable in response to temperature, is slidably fitted into the bore of the disc, and two three The valves of the port 2-way type are connected by contact, and the stopper provided on the shaft of the thermostat restricts the displacement of the disk in the direction of contraction of the thermostat, and also controls the displacement of the disk in the direction of expansion of the thermostat. If the amount of expansion or contraction of the thermostat exceeds the amount of displacement of the valve due to the stopper and each valve seat of each valve provided on both sides of the displacement direction of each valve seat, the thermostat will be displaced in that direction. The gist of the configuration of the present invention is that idle motion is generated between the thermostat and the disk and between the disk and each of the valves depending on the direction of expansion and contraction.

Therefore, with this configuration, the present invention simultaneously operates two 3-port 2-way valves that switch different passage systems according to temperature changes by using one thermostat that expands and contracts in proportion to temperature changes. With the valve seat and stopper provided on both sides of the displacement direction, when the amount of expansion and contraction of the thermostat exceeds the amount of displacement of the valve, idle movement is caused between the thermostat and the disk and between the disk and each valve depending on the direction of expansion and contraction of the thermostat. Since the stress caused by expansion and contraction of the thermostat does not act directly on the valves and valve seats, it is possible to prevent each valve from sticking to the valve seats arranged on both sides of each displacement direction, and the initial purpose can be achieved. As well as achieving
The thermostat and the disc are connected by fitting the shaft at one end of the thermostat into the bore of the disc so that it can slide freely, so the disc is held perpendicular to the thermostat, so the disc is tilted with respect to the thermostat. Therefore, the two three-port two-way valves can be reliably operated at the same time, and there is no difference between the operating temperatures of the two valves, which is a special effect.

An embodiment of the present invention will be described below with reference to the drawings. Reference numeral 2 is a thermostat having a material inside that expands and contracts according to changes in ambient temperature.

Reference numeral 6 denotes a shaft portion of the thermostat 2 whose axial length is changed by expansion and contraction of the substance.

Numeral 8 is a threaded portion that determines the attachment position of the shaft portion 6 to the thermostat body, and adjusts the switching temperature of the valve.

12, 14 and 16 each represent the housing 1 of the device of the present invention.
Communication between chambers 12 and 16 and chambers 14 and 16 is provided by a plurality of three-port two-way type valves 18 and 2, respectively.
It is opened and closed by 0.

22 and 24 are sealing parts of the valve 18, and 26 is a valve seat for the sealing part 24, which has a passage 28.

Reference numeral 30 indicates a valve seat surface relative to the seal portion 22.

A spring 32 is tensioned in the chamber 12 and biases the valve 18 in the right direction in the figure.

34 and 36 are seal portions of the valve 20, and 38 is a valve seat for the seal portion 36, which has a passage 40.

Reference numeral 44 denotes a spring tensioned within the chamber 14, which biases the valve 20 in the right direction in the figure.

48 is a disk; 50 is a guide portion formed on the disk; the right end of the shaft 6 is slidably fitted into the bore 52 of the guide portion; the disk 48 is slidably supported in the direction of expansion and contraction of the shaft 6; is held orthogonal to

A snap ring 56 that acts as a stopper is fitted into the groove 54 near the right end of the shaft 6, and this snap ring 56 contacts the left end surface of the disk 48 to prevent the rightward movement of the shaft 6 from moving toward the disk 48. tell.

Further, the right ends of the valves 18 and 20, which are biased by the spring rings 32 and 44, respectively, are directly pressed against the left side of the disk 48.

A spring 58,60 in the chamber 16 is tensioned between the right side of the disc 48 and the cover 62,
is biased toward the left in the figure, and the biasing force is exerted by spring 3.
2. From 44. It's also big.

64 is a hole formed in the disk 48, and 66 is an air filter.

In addition, 68 and 70 are passages for taking in vacuum, and 7
2 and 74 are passages communicating with the exhaust gas control device.

Note that 76 and 78 are air suction holes.

The operation of the present invention will be explained below. In order to change the length of the thermostat section 6 in the axial direction, the housing 10
The tapered threaded portion 4 is inserted into the fluid to be measured.

When the shaft portion 6 extends from the illustrated position to the right due to the operation of the thermostat 2, the disk 48 is moved to the right through the snap ring 56 against the springs 58, 60.

Movement of the disc 48 to the right causes the valve 18.2 to
0 are biased by springs 32 and 44 and actuated in the right direction in the figure, the contact between the seal portion 22 of the valve 18 and the valve seat surface 30 and the contact between the seal portion 34 of the valve 20 and the valve seat surface 42 are opened, and the passages 68 and 70 are opened. and aisles 70 and 7
4 are connected, and furthermore, the seal part 24 and the valve seal 26 and the seal part 36 and the valve seat 38 are joined, and the passage 72,
Passage 28, chamber 16, hole 78, air filter 66, hole 76, communication with the atmosphere and passage 74, passage 40, chamber 16, hole 78, air filter 66, hole 76, communication with the atmosphere is blocked.

That is, passages 72 and 74 each communicate with exhaust gas countermeasure components.
are passages 68 connecting the atmospheric conveyance to the respective vacuum sources.
, 70.

Thereafter, when the temperature of the measured fluid rises and the thermostat 2 extends the shaft portion 6 further to the right, the disc 48 separates from the right end of the valves 18, 20 and moves to the right against the springs 58, 60, or the valve 18 and 20 are held in the above-mentioned switched position by the urging force of springs 32 and 44.

Therefore, if the amount of expansion exceeds the amount of displacement of the valves 18,200, the force of the thermostat 20 due to the expansion will increase.
0, the valves 18, 20 are prevented from sticking to the valve seats 26, 38, and when the temperature subsequently decreases, the shaft portion 6 of the thermostat 2 is connected to the spring 58 via the disk 48 and the snap ring 56.
．． 60 to the left, the disc 48 is pushed to the left by the valve 18
.

If the temperature of the thermostat drops further than the illustrated position,
The valves 18, 20 are connected to the spring 5 via the disk 48.
The shaft portion 6 is held in the illustrated position by the leftward biasing force of the shaft portions 8 and 60, but the right end of the shaft portion is connected to the disk 48.
can be moved to the left to slide within the bore 52 of the guide portion 50 of.

Therefore, if the amount of contraction exceeds the amount of displacement of the valves 18, 20, the force of the thermostat 20 due to contraction will increase.
0, the valves 18, 20 are prevented from sticking to the valve seat surfaces 30, 42.

[Brief explanation of the drawing]

The drawing is a longitudinal sectional view showing an embodiment of the device of the present invention. 2: Thermostat, 6: Shaft, 18, 20: Valve, 48: Disc, 58, 60: Spring, 60
: Air filter, 68, 70: Passage communicating with vacuum, 72, 74: Passage communicating with exhaust gas countermeasure products.

Claims (1)

[Claims] 1. A thermostat that expands and contracts in the axial direction in proportion to changes in ambient temperature, a shaft that is fixed to one end of the thermostat and whose axial length changes as the thermostat expands and contracts, and the end of the shaft slides into the bore. a disk that is freely fitted and supported so as to be slidable in the direction of expansion and contraction of the shaft; a first spring that biases the disk in the direction of contraction of the thermostat; a first spring disposed in a groove formed in the shaft; a ring-shaped stopper for regulating the displacement of the disk due to the biasing force of the first spring and displacing it in the direction of extension of the shaft, the ring-shaped stopper being provided concentrically with the shaft on the outer circumferential side of the shaft; a first valve and a second valve of a 3-port 2-way type that are displaced to simultaneously switch different passage systems, respectively, the first valve and the second valve are biased in the direction of extension of the shaft to connect the disc with the disc; each second spring that is capable of abutting and whose urging force is smaller than that of the first spring; each valve seat provided on both sides of the first valve and the second valve in the displacement direction; When the amount of expansion and contraction of the thermostat exceeds the amount of displacement of each of the first and second valves due to the seat and the stopper, the displacement occurs between the shaft and the disk and between the disk and each of the valves depending on the direction of expansion and contraction of the thermostat. Temperature detection valve with idle operation.